Evaluation of soil-water parameters of a Red Latosol under pasture and 'cerrado'

Revista Brasileira de Engenharia Agrícola e Ambiental

Goedert, Wenceslau J.¹  Silva, Euzebio M. da²  Borges, Thiago A.²  Oliveira, Fernanda A.² 

[1] UnB, Brasília;Embrapa Cerrados, Planaltina

关键词: sustainability;    saturated hydraulic conductivity;    available water capacity;    Brachiaria decumbens    INTRODUÇÃO O cerrado é considerado o segundo maior bioma da América Latina;    com cerca de 204 milhões de hectares com mais de 50% de sua área coberta com pastagens cultivadas e naturais no ano 2000 (Sano et al;   

DOI  :  10.1590/S1415-43662009000100003

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The objective of this study was to evaluate the soil-water quality under grazing pastures in comparison to a natural 'cerrado' (savanna). The treatments were: natural 'cerrado', grazed 'cerrado' during the dry season, and three cultivated pastures with different degrees of soil covering. The research was conducted at the Embrapa Cerrados, on a Red Latosol in the 0-5, 10-15, 40-55, and 70-80 cm soil layers, in which the following parameters were quantified: saturated hydraulic conductivity (Ks), available water capacity (CAD), soil bulk density (Ds), and macroporosity (Ma). The soil-water quality was determined by taking as references the corresponding parameters measured in the natural 'cerrado'. Statistical similarity of CAD values in the 0-5 cm soil layer for all treatments was observed. However, there was a drastic reduction of the effective saturation in the treatments of grazed areas, mainly explained by the reduction in macroporosity. The mean decrease in Ma was 70.8%, causing a 73.6% decline in Ks in the 15 cm upper soil layer of the grazed areas, which led to the conclusion that the surface soil layers were the most affected by the grazing activity, with significant deterioration of their soil-water quality and a predictable reduction in water-infiltration capacity.

【 授权许可】

CC BY-NC